Our journey begins with a trip to another world and time, an idyllic beach during the last perfect day on the planet Venus, right before a runaway greenhouse effect wreaks havoc on the planet, boiling the oceans and turning the skies a sickening yellow. We then trace the surprisingly lengthy history of our awareness of global warming and alternative energy sources, taking the Ship of the Imagination to intervene at some critical points in time.

Courtesy of National Geographic, above is a clip from the new episode, which should have climate deniers fulminating. In it, host Neil deGrasse Tyson uses the analogy of walking a dog on the beach to helpfully explain the difference between climate and weather (pay attention, Donald Trump) and to outline why, no matter how cold you were in January, that's no argument against global warming.